ATA 61-07-60
7.3
ADVANCED/NEW INSTALL OPERATION WITH I/O FEATURES (J1 WIRED, J2 WIRED)
This mode makes use of additional features like external heater-enable, Self-test activation or weight-on-
wheels deactivation. An overview of this features follows in table 8.
For this mode power of J1 has to be supplied. After power supply the EDC will perform a Self-test to check
the correct function of the De-Icing and the EDC for up to 7 seconds. After that the heating sequence can
be started by “Heater-Enable”
Function
Description
Heater-Enable
Activates heater outputs if Heater-Enable is activated (pulled to ground).
Self-Test
Triggers the device Self-test if activated (connected to ground). The
usage is optional.
WoW
Deactivates heater outputs if WoW signal active (connected to ground).
The usage is optional.
Warning Output
(normally closed)
Indicates device failures,failure of Deice-System (Deice Boots, Wires,
etc…) and status as described in 7.3.5. Normally closed (connected to
ground) switch is active if EDC is unsupplied. Can be used to detect loss
of supply power. The usage is optional.
Warning Output
(normally open)
Indicates device failures, failure of Deice-System (Deice Boots, Wires,
etc…) and status as described. Normally open (not connected to ground)
switch is open if EDC is unpowered. The usage is optional.
Table 8: Special Functions
7.3.1
Functional checks referring to 1.3.1
The Self-test described under 7.3.3 covers all needed checks. It could be performed anytime the De-Icing
is not operating.
If the Warning Output is inactive after a Self-test, the EDC is in an airworthy condition.
7.3.2
Heater-Enable
To use this input, the EDC must be supplied permanently with supply voltage. The heating sequence will
then be activated by the heater-enable signal. After disable the heating sequence will be reset.
7.3.3
Self-Test
The advanced EDC includes a Self-test function which checks functionality of internal control logic,
warning output and output loads.
The Self-test is executed at every power up (power supply J1-P). During Self-test, the warning output is
active for 3-7 sec., allowing a lamp test of the connected warning lamps. After the Self-test was run
successful, the EDC is ready for normal operation, indicated by an inactive warning output. If the Self-test
was not successful, the warning output remain active.
The Self-test procedure can be triggered any time if the device has power supply but output sequence is
not active. The Self-test input can be connected to a push button or switch. Be aware when using a switch
that the device remains in Self-test mode if the switch state is active.
Important:
The Self-test with propeller inoperating could fail sometime and the warning will be active due to
not sufficient electrical contact of the brush blocks.
Repeat the Self-test with engine running, the warning will be reset if the current is inside the
operational range.
Page 14
Original Issue
2021-07-01
